164PM 1/2" x 4" Piece Maker™ Drill Driven Knockout Set - Current Tools
AMZCNC Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 1/2 to 4 inch (15T(1/2"-4")) : Amazon.ca: Tools & Home Improvement
AMZCNC Hydraulic Knockout Hole Punch Driver Kit 1/2 to 4 inch Electrical Conduit Hole Cutter Set KO Tool Kit Metal Sheet Puncher (12TON(1/2"~4")) : Amazon.ca: Tools & Home Improvement
Klein Tools 53727SEN Knockout Punch Set, 3/4-Inch : Amazon.ca: Tools & Home Improvement
TH0390 – Manual Knockout Punch Driver Kit for ½ inch to 2 inch Electrical Conduit Hole Sizes (